Add a banner to indicate updates in progress

server/src/live-reload.ts

@@ -43,3 +43,22 @@ export function broadcastReload(reason: string, data?: Record<string, unknown>):
   }
 }
 
+export type UpdateStatusPhase = 'request_received' | 'update_started' | 'update_done';
+
+export function broadcastUpdateStatus(phase: UpdateStatusPhase, data?: Record<string, unknown>): void {
+  if (!wss) return;
+
+  const payload = JSON.stringify({
+    type: 'update_status',
+    ts: Date.now(),
+    phase,
+    ...data,
+  });
+
+  for (const client of wss.clients) {
+    if (client.readyState === client.OPEN) {
+      client.send(payload);
+    }
+  }
+}
+